<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>

<script type="text/javascript">

let { prop: x } = undefined;
let { prop: y }	= null;
//解构赋值  如果等号右边的不知对象是，就会转为对象
//所以在将null和undefined转为对象时会报错

</script>

</body>
</html>